Working with OrcaleDataAdapter

I am having difficulties updating rows in the DB when working with a dynamic data adapter update command.

This means that not only I specify the changed value, I also specify the columns where the change is done.

Short description:
I am implementing a RollBack function, I have a table containing changes done in different tables.
That table includes the fields:
TABLE_NAME - name of the table where the change was done
NEW_VALUE - The value the field changed to.
OLD_VALUE - The previous value the field had
FIELD_NAME - The field name where the change was done

some other irrelevant fields that contain the PK's field name and value.

So basically when I try to update it would look like that:
foreach (DataRow drChangedRow in dtChangedTbl.Rows)
{
drTableToUpdate[drChangedRow[FIELD_NAME]] = drChangedRow[OLD_VALUE];
}

(Sorry for the detailed desc just don't want misunderstandings)

Now when I try to update the OracleDataAdapter, I need to specify an UpdateCommand to it.